I have the good tweezers (though I'm not sure offhand where in the mess that is my desk that they have wandered to) and I bought syringes (?) of liquid flux and I think solder too, along with a few schmartboards, because I accidentally bought the SMT version of the CA3140 a little bit back But I haven't actually used them yet.

I think jmejia is doing an universal board that will work for all formats, an I think he will sell those.

Mine is 1U MOTM format, but i won't sell them. All the info and gerbers files are free to download on my site (sdiy.xpmtl.net). You'll have to send the gerbers to a fab house and source/populate the boards yourself.

Cheers,

x.

Woow great work!
Looking forward to your gerber files!

We'll also be publishing gerbers of our through-hole layout if you prefer (and aren't in a hurry) Still waiting on some replacement parts before we can do the final testing of the layout - but it's def. top priority on the bench right now.

For the resistors/caps, put a small amount of solder on one pad, align the component and slide it in place as you heat the pad. Then solder the other end. For the ICs, use Flux and solder one pin first as you align the component with tweezers. After that solder the remaining pins one by one or use the sliding method ( look on Youtube, there a bunch of tutorials for soldering SMT).

I have a Hot air station but i find the results less clean than with a soldering iron. Usually components pop out of their place when i apply heat. I think my soldering paste is not very good. It's new tho (Chipquick™ water washable leaded)

As for my lack of updates lately, i had a car crash and i need to find/finance a new car so SDIY is a bit on hold... should resume mid cctober when i get back from holidays. I'll make a prototype of the frontpanel then and post the .fpd file on my site.
If anyone wants the file now i can PM it but you'll have to triple check it as it still has errors.

SMT isnt difficult at those sizes
I normally do that size with a standard iron , normal solder and little blobs of bluetack to temporarily hold things in place while i solder the other end:lol: certainly quicker than thru hole_________________In an infinite universe one might very well
ask where the hell am I
oh yeah thats right the land of OZ
as good an answer as any

I only recently came across this thread and got real exited and purchased some boards.

Ive been looking at the schematic, and see some potential improvements (if there is ever another design revision) since most people seem to be aiming to use this in a modular setup, with a shared power supply.

1. LEDs. Namely connected to the ground. The lfo led bothers me the most because its hard switching 10-20mA continuously onto the ground. better if it was connected to a rail. Or if crazy anal, also constant current sourced with a shunt FET to switch it. As much as I would like the LEDs, I'll probably leave them off my build because of this. Another thought with the lfo is to stick a bi-colour in the feedback around the Schmitt trigger.
2. The voltage rails being used as voltage references. The resistor in the noise source, pitch/offset/null pots. There is possibly some others.

It probably works fine as is, but good practice in modular design is to use the ground as a reference (not a current sink), use voltage references for other voltages and to use the power rails only for power. Much of this would not have been an issue in the original stand alone unit.

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